Threshing mechanism.



, No. 878,901. PATENTED FEB, 11, 1908.

J. W. SHELBOURN. THRESHING MECHANISM.

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JOHN W. SHELBOURN, OF GRAND ISLAND, NEBRASKA.

THRESI-IING MECHANISM.

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application filed February 28. 1906- Serial No. 303.420.

To all whom it may concern:

Be it known that I, J OHN W. SHELBOURN, a citizen of the United States,residing at Grand Island, in the county of Hall, State of Nebraska, haveinvented certain new and useful Improvements in Threshing Mechanism; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to threshing mechanism and has for its objecttoprovide a mechanism including a concave provided with series of teeth,the series being arranged for independent adjustment and the concavebeing arranged for bodily adjustment with respect to the cylinder.

1 Other objects and advantages will be apparent from the followingdescription.

In the drawings forming a portion of this specification and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a view of a portion of the mechanism embodying the presentinvention, the cylinder being shown in end elevation. Fig. 2 is a viewlooking at right angles to Fig. 1 and showing the crank shaft. Fig. 3 isa section on line 33 of Fig. 2 taken transversely of the cylinder,several of the tooth bars being set at different angles. Fig. 4 is aview showing the tooth bars in top plan and the cylinder in section online 44 of Fig. 1.

Referring now to the drawings, there is shown a revoluble cylinder 5having peripheral teeth 6 arranged in the usual manner. At one side ofthe cylinder, there are disposed a pair of arcuate end plates 7 whichlie concentric with the cylinder and which also lie at opposite endsthereof. These end plates are provided with a plurality of alining pairsof perforations 8 and in each pair are engaged the trunnion ends 9 oftooth bars 10 which carry teeth 11 and these tooth bars are movable tovary the angle of their teeth with respect to the cylinder 5.

The end plates 7 are each provided at their upper ends With transverseoutwardly extending sleeves 12 which register for the reception of thecrank portion 13 of the crank shaft 13 mounted at its ends in suitablebrackets 14 and this crank shaft is thus operable to move the concaveformed by the end plates 7 and the tooth bars 10 toward and away fromthe cylinder 5.

One trunnion 9 of each of the tooth bars 10 carries a rack wheel 15,these rack wheels lying outwardly of theadjacent end plates 7 andpivoted to this end plate, there are a plurality of dogs 16 one for eachrack Wheel, which are disposed for engagement of the rack wheels to holdthem against rotation.

A handle is provided for engagement of a squared end 17 of the shaft 13and may also be engaged with the squared ends 9 of the trunnions 9 whichcarry the racks 15, and it will thus be seen that the tooth bars maybemoved independently of each other to bring their teeth toward and awayfrom the cylinder and that the concave may be bodily moved throughoperation of the shaft 13.

Guides 19 are provided for the lower ends of the end plates 7 and alsoact as supports therefor.

What is claimed is:

In an adjustable threshing mechanism, the combination with a revolublymounted cylinder, of a concave disposed in operative relation to thecylinder, said concave including arcuate end plates, tooth barsrevolubly engaged in the end plates and extending longitudinally of thecylinder, said tooth bars being arranged for independent movement, teethcarried by the bars and extending toward the cylinder, means for holdingthe bars at different points of their movement, brackets, a shaftmounted at its ends in the brackets and having a crank portion, sleevescarried by the arcuate plates and in which the crank portion of theshaft is revolubly engaged, said shaft being movable to move the concavetoward and away from the cylinder, and guides for the lower ends of theplate.

In testimony whereof, I aflix my signature, in presence of twoWitnesses.

JOHN W. SHELBOURN.

Witnesses:

A. M. HARGIS, A. L. AYER.

